package main

import (
	"fmt"
	"net/http"
	"os"
	"strconv"

	"github.com/joho/godotenv"

	"darjeeling.systemec.nl/rhouben/fibonacci/functions"
)

func main() {
	var port_number int = 8098 // hard default
	var error error
	var bind_socket string
	fmt.Println("Hello, world. I'm teaching myself Go.")

	error = godotenv.Load() // Load .env file
	if error != nil {
		fmt.Printf("Error trying to load .env file: %s\n", error)
	}
	port_arg := os.Getenv("FIB_PORT")
	if port_arg != "" {
		fmt.Printf("Loaded port value '%s' from environment.\n",
			port_arg)
	}
	if len(os.Args) > 1 { // commandline overrules env
		port_arg = os.Args[1]
		fmt.Printf("Loading port value '%s' from command line.\n",
			port_arg)
	}

	if port_arg != "" {
		port_number, error = strconv.Atoi(port_arg)
		if error != nil {
			fmt.Printf("I had an error trying to parse '%s' into a number: %s\n",
				port_arg,
				error)
			os.Exit(0)
		}
	}
	bind_socket = fmt.Sprintf(":%d", port_number)
	http.HandleFunc("/fibonacci", functions.HttFibonacci)
	http.HandleFunc("/sum", functions.HttSum)
	fmt.Printf("Listening on port %d...\n", port_number)
	http.ListenAndServe(bind_socket, nil)
}